NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Calibrating a sextant scale
From: Fred Hebard
Date: 2007 Nov 21, 12:38 -0500
From: Fred Hebard
Date: 2007 Nov 21, 12:38 -0500
On Nov 21, 2007, at 11:37 AM, Alexandre E Eremenko wrote: > Fred, > >> Fred Hebard wrote: > >>> The problem is getting a precise star-to-star >>> distances. I don't believe anybody claims to >>> have solved that >>> problem. > > I am not sure that I understand which problem exactly > you address here. COMPUTING the star-to-star distances > for given moment at given position is not a problem at all. > With all corrections. > > But MEASURING them with a sextant with sufficient > precision to obtain your sextant > calibration (arc correction) > seems (to me at least) a hopeless problem. > I spent several years, making hundreds of observations > trying to do this. It just does not work. > > Alex. Alex, I agree. That's what I was trying to say. I should have said, "The problem is MEASURING a precise star-to-star difference." My only quibble is that you might rephrase your conclusion to, "I could not get it to work." Maybe a more skilled observer than you or I might be able to get it to work. Fred --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---